Jaspers 4L60E Transmission and Bully Dog GT Tuner

Okay I'm new here so Moderators please don't beat me up too bad. I done several searches on the forum for "Jaspers 4L60E Transmission" with no matches found.

Which brings me to my question, I have a 2005 Z71 Silverado with 64000 miles on it. Christmas eve while driving home thru Washington DC my transmission started slipping and not shifting up or down. I made it home and had it towed to a buddy's shop on 12/26/13, after I uninstalled the Bully Dog GT tuner setup I had installed on it, which I had all of the trans settings set to stock and I upploaded the stock OEM configuration. He said the trans was done swapped the OEM trans for a Remanufactured Jaspers 4L60E Transmission. He said they are much better than th OEM trans and not to worry. He changed all of the drivetrain fluids: front diff, rear diff and transfer case with Lucas Synthetic all for $2900.00. I got the truck back put the Bully dog back in and set the trans settings to tow.

Now I have 3 questions:
1. Has anyone had any issues with the Jaspers remanufactured transmissions and does that sound like a fair price?

2. Does anyone have sugesstions on how I should setup the Bully Dog to improve performance and fuel economy?

3. I'd like opinions on the Bully Dog GT Tuner are they worthy or are they a POS and part of the problem?

I have never heard of anyone having an issue with Jasper engines or transmissions. that price seems high for my area. in my area rebuild with some upgrades is $1200-$1700 and $500 to remove and replace it in the vehicle. A rebuilt, upgraded, and tested trans directly from GM is $1300 (employee price).

Also, is it normal for one to blow with no warning at all? The next morning it would only move forward even in reverse. It never showed signs of slipping, leaks, the fluid still looke clean and red. But damn if it didn't kill the end of 2013 for me.